LG LMH1017CVW Service Manual
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LG LMH1017CVW Service Manual

LG LMH1017CVW Service Manual

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Download this manual See also: Owner's Manual, Owner's Manual & Cooking Guide

MICROWAVE OVEN

SERVICE MANUAL
MODEL: LMH1017CVW
CAUTION
BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
P/NO : 3828W5S6006
LMH1017CVB
LMH1017CVST
Website: http://us.lgservice.com
Printed in Korea
May, 2004

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Summary of Contents for LG LMH1017CVW

  • Page 1: Microwave Oven

    Website: http://us.lgservice.com MICROWAVE OVEN SERVICE MANUAL MODEL: LMH1017CVW LMH1017CVB LMH1017CVST CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. May, 2004 P/NO : 3828W5S6006 Printed in Korea...

  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY...

  • Page 3: Table Of Contents

    CONTENTS (Page) SAFETY PRECAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Inside front cover SPECIFICATIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 1-1 CAUTIONS - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 2-1 INSTALLATION - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 3-1...

  • Page 4: Specifications

    SPECIFICATIONS ITEM DESCRIPTION MODEL LMH1017CVW, LMH1017CVB, LMH1017CVST Power Requiremen 120 V AC, 60 Hz Single phase, 3 wire grounded Microwave 1,400W Convection 1,350W Combination 1,500W Power Output 1,000 Watts full microwave power (IEC60705) Microwave Frequency 2,450 MHz Magnetron 2M246-050GF 0 ~ 99 min. 99 sec.

  • Page 5: Cautions

    CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connected.

  • Page 6: Installation

    INSTALLATION BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. INSTALLING GROUNDING INSTRUCTIONS 1. Empty the microwave oven and clean inside it with For personal safety, this appliance must be fully a soft, damp cloth. Check for damage such as grounded at all times.

  • Page 7: Operating Instructions

    OPERATING INSTRUCTIONS FEATURES Oven Front Plate Window Door Screen Door Seal Metal Tray Glass Turntable Display Window Rotating Ring Metal Rack Control Panel Safety Interlock System CONTROL PANEL 1. DISPLAY. The display includes a clock and indicators that tell you time of day, cooking time settings, and cooking functions selected.

  • Page 8: Operating Sequence

    OPERATING SEQUENCE The following is a description of component functions during oven operation. 1. SETTING THE CLOCK 5. MORE / LESS This pad is to be used as a temperature selection Desired Clear Clock Start/Pause pad in convection mode and cook time adjustment clock pad in the microwave mode.
  • Page 9 OPERATING SEQUENCE 9. SENSOR TOUCH 12. CONVECTION TO PREHEAT Sensor Cook/ Select Recipe Clear Reheat Categories Select Clear Convection Temperature Clear Popcorn Start/Pause 10. DEFROST AUTO/TIME TO COOK(After preheating) Cooking Time Start/Pause Auto/Time Select Recipe Clear Defrost Categories 13. COMBINATION Enter the Start/Pause Weight...

  • Page 10: Schematic Diagram

    SCHEMATIC DIAGRAM AC 120V/60Hz SINGLE PHASE ONLY THERMISTOR FUSE (CN2) L.V.TRANSFORMER OVEN THERMOSTAT OVEN LAMP MAIN RELAY (RY1) PRIMARY SWITCH TURN MOTOR TABLE RELAY MOTOR (RY4) T.T.M CIRC. MOTOR RELAY (RY6) MOTOR HEATER RELAY (CN1) CONVECTION HEATER (RY5) CONVECTION MOTOR POWER RELAY MONITOR...

  • Page 11: Circuit Description

    CIRCUIT DESCRIPTION GENERAL DETAILS WHEN THE DOOR IS OPENED DURING COOKING • The low voltage transformer supplies the necessary voltage to the micom controller when power cord is • Both the primary switch and relay 2 cut off the primary plugged in.

  • Page 12: Service Information

    SERVICE INFORMATION TOOLS AND MEASURING INSTRUMENTS NECESSARY TOOLS NECESSARY MEASURING INSTRUMENTS Tools normally used for TV servicing are sufficient. • TESTER (VOLTS-DC, AC, Ohmmeter) Standard tools are listed below. • Microwave survey meter • Diagonal pliers - Holaday HI-1500 • Long nose pliers HI-1501 •...

  • Page 13: Record Keeping And Notification After Measurement

    MEASUREMENT WITH OUTER CASE NOTES WHEN MEASURING REMOVED • Do not exceed meter full scale deflection. • The test probe must be removed no faster than • When you replace the magnetron, measure for 1 inch/sec (2.5 cm/sec) along the shaded area, microwave energy leakage around the door view otherwise a false reading may result.

  • Page 14: Measurement Of Microwave Power Output

    MEASUREMENT OF MICROWAVE POWER OUTPUT • Microwave power output measurement is made with the • The microwave power output P in watts is calculated microwave oven supplied at its rated voltage and from the following formula: operated at its maximum microwave power setting with a load of (1000 ±...
  • Page 15 D. P.C.B ASSEMBLY REMOVAL Remove choke cover 1) Remove the control panel assembly from the cavity. (Refer to control panel assembly removal on previous page.) 2) Remove screws which hold the P.C.B SUB ASS’Y to the control panel. 3) Pull P.C.B. SUB ASS’Y carefully from the control panel.
  • Page 16 F. AIR DUCT ASSEMBLY REMOVAL G. MAGNETRON REMOVAL 1) Disconnect the leadwire from lamp and MGT 1) Remove the mounting screw holding the magnetron thermostat. and air duct ass’y. 2) Remove the mounting screw to the magnetron. 2) Disconnect the leadwire from the magnetron. 3) Carefully remove the mounting screws holding the magnetron and the waveguide.

  • Page 17: Diode Removal

    H. THE TURNTABLE MOTOR I. HIGH VOLTAGE TRANSFORMER REMOVAL REMOVAL 1) Remove the turntable and rotating ring. 1) Discharge the high voltage capacitor. 2) Lay the unit down on its back. 2) Disconnect the leadwire from magnetron, and high 3) Remove the turntable motor cover. voltage capacitor.
  • Page 18 L. INTERLOCK SYSTEM M. C-MOTOR, THERMISTOR AND SHEATH HEATER REMOVAL 1) INTERLOCK MECHANISM The door lock mechanism is a device which has 1) Remove back cover after untieing four screws been specially designed to eliminate completely securing the cover assembly to the oven cavity. microwave activity when the door is opened during 2) Disconnect the leadwire from the circulation motor cooking and thus to prevent the danger resulting...

  • Page 19: Interlock Continuity Test

    INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62 OR VP-532A-OF FOR MONITOR SWITCH TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF FOR SECONDARY SWITCH A.

  • Page 20: Component Test Procedure

    COMPONENT TEST PROCEDURE CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.
  • Page 21 COMPONENTS TEST PROCEDURE RESULTS Antenna Gasket Chassis Filament NOTE: When testing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condition. HIGH VOLTAGE Measure the resistance. Normal: Momentarily indicates CAPACITOR (Ohm-meter scale: Rx10,000) several ohms, and...
  • Page 22 COMPONENTS TEST PROCEDURE RESULTS Normal Abnormal FUSE Check for continuity of the switch with a (Wire leads removed.) Multi-meter. NOTE: If the fuse is blown, check the primary, the secondary, and the monitor switches, H.V.D. and H.V.C. before replacing the fuse. If the fuse is blown by improper switch operation replace the defective switch and the fuse at the same time.
  • Page 23 COMPONENTS TEST PROCEDURE RESULTS CIRCULATION MOTOR Measure the resistance. Normal : Approx. 29.5 ohm (Wire leads removed) (Multi-meter scale : R x 1) Abnormal : Infinite or several ohm. TURNTABLE MOTOR Measure the resistance. Normal : Approx. 3.48 Kohm (Wire leads removed) (Ohm-meter scale : R x 1000) Abnormal : Infinite or several ohm.

  • Page 24: Trouble Shooting

    TROUBLE SHOOTING WHEN YOU GET A COMPLAINT FROM YOUR CUSTOMER, EVALUATE THE COMPLAINT CAREFULLY. IF THE FOLLOWING SYMPTOMS APPLY, PLEASE INSTRUCT THE CUSTOMER IN THE PROPER USE OF THE MICROWAVE OVEN. THIS CAN ELIMINATE AN UNNECESSARY SERVICE CALL. CAUTIONS 1. Check grounding before checking for trouble. 2.
  • Page 25 (TROUBLE 1) The following visual conditions indicate a probable defective control circuit. 1. Incomplete segments. • Segment missing. • Partial segment missing. • Digit flickering (NOTE: Slight flickering is normal.) 2. Colon does not turn on or blink. 3. A distinct change in the brightness of one or more numbers in display. 4.
  • Page 26 (TROUBLE 2) Oven does not operate at all, display window does not display any figures, and no input is accepted. CONDITION CHECK RESULT CAUSE REMEDY Malfunction of the Replace fuse, Check continuity 1. Fuse blows. Continuity. monitor switch. primary, monitor, of monitor secondary switch (with...
  • Page 27 (TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired program times are set and START pad is touched. CONDITION CHECK RESULT CAUSE REMEDY Defective Replace 1.Setting time does Check continuity No continuity. secondary switch. secondary switch.
  • Page 28 (TROUBLE 5) No microwave oven operation even though oven lamp and fan motor run (Display operates properly) CONDITION CHECK RESULT CAUSE REMEDY Defective P.C.B No microwave Replace P.C.B Disconnect the No continuity. oscillation. assembly assembly wire leads from relay 2 and check continuity Continuity.
  • Page 29 (TROUBLE 6) Convection oven does not operate at all or convection cook is bad. CONDITION CHECK RESULT CAUSE REMEDY Defective Relay Replace Relay Convection indicator Check the Relay Abnormal 4 or 6. 4 or 6. light but oven does 4 or 6 of P.C.B. not go into cook assembly .

  • Page 30: Exploded View

    EXPLODED VIEW INTRODUCTION MODEL NO. LMH1017CVW LMH1017CVB LMH1017CVST CONVECTION CHAMBER OVEN CAVITY PARTS INTERIOR PARTS DOOR PARTS BASE PARTS PARTS LATCH BOARD PARTS CONTROL PANEL PARTS...

  • Page 31: Door Parts

    DOOR PARTS 13581A 15006A 13552A 13213A For Model LMH1017CVST 13551A 14890A 13720D 14026A 14970A...

  • Page 32: Control Panel Parts

    CONTROL PANEL PARTS 24781M For Model LMH1017CVST 23551A 23572A 268711 23506A WTP015...

  • Page 33: Oven Cavity Parts

    OVEN CAVITY PARTS 33112U WTT021 WSZ094 WSZ185 33052M WTT047 35026G 36549S 33390M 33390G WTP013 34370T 35889A...
  • Page 34 LARCH BOARD PARTS 43501A WSZ085 466001 43500A 466003 466001 44510A...

  • Page 35: Interior Parts

    INTERIOR PARTS 33808A WTT021 50FZZA WSZ002 568771 55006F 56411A WTT022 56322A WTT022 54975G WTT021 55900C 36549C 54350S 54810S 56930M 55900N WNH002 WWP008 54810A WNH003 53504A WWS005 WMT002 56208A 35300S WTT028 56549F WSZ002 55900A WTT037 WSZ002 54974S 34930W WTP004 56324A 56930G 56851D 56912B WSZ002...

  • Page 36: Base Plate Parts

    BASE PLATE PARTS 56170D 63302A 63303A 948502 647781 WSZ002 WTT030 WTT021...
  • Page 37 SENSOR PARTS WTP002 WTT021 56501A 54974T...

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